ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAK SCIENCE 



MONTHLY 



EDITED BY WILLIAM JAY YOUMANS. 



VOL. XLIII. 



MAY TO OCTOBER, 1893. 



NEW YORK : 



D. APPLETON AND COMPANY, 



1, 3, AND 5 BOND STREET. 



1893. 



